Chromospheres of the active dwarf binaries EQ Pegasi and XI Bootis

Details Chromospheres of the active dwarf binaries EQ Pegasi and XI Bootis Chromospheres of the active dwarf binaries EQ Pegasi and XI Bootis

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l..69h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Oct. 15, 1979, p. L69-L72.

Astronomy and Astrophysics

Astronomy

54

Binary Stars, Chromosphere, Dwarf Stars, Flare Stars, Iue, Late Stars, Astronomical Spectroscopy, Emission Spectra, Line Spectra, M Stars, Ultraviolet Astronomy, Ultraviolet Spectra

Scientific paper

Ultraviolet spectroscopic measurements of the M dwarf binary EQ Peg and the G8 V star Xi Boo A have been made with the International Ultraviolet Explorer satellite. High-temperature emission lines (N V, C IV, Si IV) are present with similar strengths in both stars. The surface fluxes of chromospheric and transition-region lines are enhanced relative to those of normal main-sequence stars and are comparable to those observed in solar active regions. If inhomogeneities are present, the surface fluxes may be markedly higher than the derived values. It is likely that the emission observed from EQ Peg was not the result of major flare activity; however, the quiescent radiative losses observed in the ultraviolet are comparable to the time-averaged optical flare losses. The similarity of the line emissions of active dwarfs of diverse spectral types suggests that the character of the transition region is independent of the stellar effective temperature.

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